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Reduction of Helicopter BVI Noise, Vibration, and Power Consumption Through Individual Blade ControlA wind tunnel test was conducted with a full-scale BO 105 helicopter rotor to evaluate the potential of open-loop individual blade control (IBC) to improve rotor performance, to reduce blade vortex interaction (BVI) noise, and to alleviate helicopter vibrations. The wind tunnel test was an international collaborative effort between NASA/U.S. Army AFDD, ZF Luftfahrttechnik, Eurocopter Deutschland, and the German Aerospace Laboratory (DLR) and was conducted under the auspices of the U.S./German MOU on Rotorcraft Aeromechanics. In this test the normal blade pitch links of the rotor were replaced by servo-actuators so that the pitch of each blade could be controlled independently of the other blades. The specially designed servoactuators and IBC control system were designed and manufactured by ZF Luftfahrttechnik, GmbH. The wind tunnel test was conducted in the 40- by 80-Foot Wind Tunnel at the NASA Ames Research Center. An extensive amount of measurement information was acquired for each IBC data point. These data include rotor performance, static and dynamic hub forces and moments, rotor loads, control loads, inboard and outboard blade pitch motion, and BVI noise data. The data indicated very significant (80 percent) simultaneous reductions in both BVI noise and hub vibrations could be obtained using multi-harmonic input at the critical descent (terminal approach) condition. The data also showed that performance improvements of up to 7 percent could be obtained using 2P input at high-speed forward flight conditions.
Document ID
20020015984
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Jacklin, Stephen A.
(NASA Ames Research Center Moffett Field, CA United States)
Blaas, Achim
(Zahnradfabrik Friedrichshafen A.G. Calden, Germany)
Teves, Dietrich
(Eurocopter Deutschland G.m.b.H. Munich, Germany)
Kube, Roland
(Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Brunswick, Germany)
Warmbrodt, William
Date Acquired
August 20, 2013
Publication Date
January 1, 1994
Subject Category
Aircraft Design, Testing And Performance
Meeting Information
Meeting: AHS 51st Annual Forum and Technology Display
Location: Fort Worth, TX
Country: United States
Start Date: May 9, 1995
End Date: May 11, 1995
Sponsors: American Helicopter Society, Inc.
Funding Number(s)
PROJECT: RTOP 505-59-36
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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